"A brief functionality outage in Delta software that powers ground operations resulted in approximately two dozen short boarding delays in the noon hour Eastern time Tuesday," a Delta representative told CNBC. "Delta does not expect any further delays due to this minor issue. At no time were any flights en route adversely affected."

The airline was last in the headlines for an unrelated incident where two fighting flight attendants led to an unscheduled landing in Salt Lake City at the end of January, Delta acknowledged Monday to The Associated Press.

Shares of Delta were down more than 3 percent midday Tuesday and have fallen about more than 5 percent over the past year.